See: Description
| Class | Description | 
|---|---|
| ItemsByTag | A heterogeneous map from  Tag<E>toE, whereEcan be different for each tag. | 
| KeyedWindowResult<K,R> | Holds the result of a group-and-aggregate operation performed over a
 time window. | 
| Tag<T> | A tag object useful as a key in heterogeneous maps. | 
| TimestampedItem<T> | Mutable wrapper around an item that adds a timestamp. | 
| Tuple2<E0,E1> | An immutable 2-tuple (pair) of statically typed fields. | 
| Tuple3<E0,E1,E2> | An immutable 3-tuple (triple) of statically typed fields. | 
| Tuple4<E0,E1,E2,E3> | An immutable 4-tuple of statically typed fields. | 
| Tuple5<E0,E1,E2,E3,E4> | An immutable 5-tuple of statically typed fields. | 
| WindowResult<R> | Holds the result of an aggregate operation performed over a time
 window. | 
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